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Poster: Moongleam Date: Dec 23, 2011 7:51am
Forum: feature_films Subject: Re: Uploaders, advice please!

I don't know how experienced you are with transcoding, so this info may be superfluous.

1. If size matters, use a two-pass encoding. This is imperative.

2. Before you rescale an interlaced (telecined) film vertically, first use a delacing filter or a pullup filter. This is imperative.

3. h.264 (x264) seems to be the video codec that is best for producing the smallest files without video degradation. (x264 has so many esoteric options that it can be difficult to decide which to use.)

4. A bitrate less than 1000 kb/s should be sufficient. With x264, you can sometimes go as low as 700 kb/s. Video noise, however, will tend to use up bits. A denoising filter should be used on dirty or scratchy videos. (It doesn't have to remove all of the noise.)

5. You will probably want to rescale the picture to a smaller size in order to save bits. I've seen pictures as small as 512x384 that seemed sharp. If you have an NTSC video sized 720x480, you should at least rescale it to 640x480 to make the pixels square.

6. Both the horizontal and the vertical dimension of the picture should be divisible by 16. The transcoder will be hampered if they are not.